OF CONCHOLOGY. 157 



21. BuLiMUS MixMOSARUM, d'Orb. 



On wet rocks and among weeds in the fosse to the fort at 

 Castillo ; very abundant. Recorded from Bolivia. 



[BuLiMUS Tryoniani'S, Tate. Plate 16, fig. 4. 



Shell conically subulate, semipellucid, not umbilicated, whorls 

 seven in number, rather flattened, shouldered at the suture, orna- 

 mented with numerous nearly straight longitudinal costre, inter- 

 stitial spaces smooth ; suture somewhat impressed ; columella a 

 little thickened ; aperture elliptical ; outer lip straight and sim- 

 ple. 



Total length of shell -22 inch ; breadth 0-075 inch ; height of 

 last whorl 0-075 inch. 



In the forest on an island in the lagoon of Boca del Toro, on 

 the borders of Panama and Costa Rica.] 



[BuLiMUS PLICATELLUS ? Guppy [Stenogyro). 



The examples collected appear to be young shells of this West 

 Indian species. Living with B. Tryonianus, &c. Boca del Toro.] 



22. ACHATINA OCTONA, Chem. 



Throughout the savanna region, Grenada, San Ubaldo, and at 

 Castillo and Greytown, Nicaragua. Also at Boca del Toro, 

 Naval Bay, and Matachin, Panama. 



[TORNATELLINA INTERSTRIATA, Tate. Plate 16, fig. 5. 



Shell acuminately oblong, subdiaphanous, light horn color, 

 shining, ornamented with many sinuate longitudinal costjfi, the 

 interstitial spaces with about three costellge ; whorls 7 — 8, con- 

 vex, suture well defined ; apex blunt, smooth ; aperture ellipti- 

 cal ; outer lip thin, simple, straight ; columella obliquely trun- 

 cate, twisted, reflexed, forming an umbilical fissure ; no parietal 

 plait ; last whorl forming nearly half the length of the shell. 



Dimensions. — Total length of shell, 

 Height of last whorl, 

 Breadth of shell. 



Living in company with Bulimus Tryonianus, &c. Boca del 

 Toro, Panama.] 



23. TORNATELLINA HYALINA, Tate. 



Related to T. interstriata, hyaline, with a higher and more 

 inflated body whorl. 



Total length •23 inch; height of last whorl '12 ; breadth '15. 



